projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Linux 4.8.2
[deliverable/linux.git] / net / netfilter / nf_conntrack_proto_sctp.c
1 /*
2 * Connection tracking protocol helper module for SCTP.
3 *
4 * Copyright (c) 2004 Kiran Kumar Immidi <immidi_kiran@yahoo.com>
5 * Copyright (c) 2004-2012 Patrick McHardy <kaber@trash.net>
6 *
7 * SCTP is defined in RFC 2960. References to various sections in this code
8 * are to this RFC.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/types.h>
16 #include <linux/timer.h>
17 #include <linux/netfilter.h>
18 #include <linux/module.h>
19 #include <linux/in.h>
20 #include <linux/ip.h>
21 #include <linux/sctp.h>
22 #include <linux/string.h>
23 #include <linux/seq_file.h>
24 #include <linux/spinlock.h>
25 #include <linux/interrupt.h>
26
27 #include <net/netfilter/nf_conntrack.h>
28 #include <net/netfilter/nf_conntrack_l4proto.h>
29 #include <net/netfilter/nf_conntrack_ecache.h>
30
31 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
32 closely. They're more complex. --RR
33
34 And so for me for SCTP :D -Kiran */
35
36 static const char *const sctp_conntrack_names[] = {
37 "NONE",
38 "CLOSED",
39 "COOKIE_WAIT",
40 "COOKIE_ECHOED",
41 "ESTABLISHED",
42 "SHUTDOWN_SENT",
43 "SHUTDOWN_RECD",
44 "SHUTDOWN_ACK_SENT",
45 "HEARTBEAT_SENT",
46 "HEARTBEAT_ACKED",
47 };
48
49 #define SECS * HZ
50 #define MINS * 60 SECS
51 #define HOURS * 60 MINS
52 #define DAYS * 24 HOURS
53
54 static unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = {
55 [SCTP_CONNTRACK_CLOSED] = 10 SECS,
56 [SCTP_CONNTRACK_COOKIE_WAIT] = 3 SECS,
57 [SCTP_CONNTRACK_COOKIE_ECHOED] = 3 SECS,
58 [SCTP_CONNTRACK_ESTABLISHED] = 5 DAYS,
59 [SCTP_CONNTRACK_SHUTDOWN_SENT] = 300 SECS / 1000,
60 [SCTP_CONNTRACK_SHUTDOWN_RECD] = 300 SECS / 1000,
61 [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS,
62 [SCTP_CONNTRACK_HEARTBEAT_SENT] = 30 SECS,
63 [SCTP_CONNTRACK_HEARTBEAT_ACKED] = 210 SECS,
64 };
65
66 #define sNO SCTP_CONNTRACK_NONE
67 #define sCL SCTP_CONNTRACK_CLOSED
68 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
69 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
70 #define sES SCTP_CONNTRACK_ESTABLISHED
71 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
72 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
73 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
74 #define sHS SCTP_CONNTRACK_HEARTBEAT_SENT
75 #define sHA SCTP_CONNTRACK_HEARTBEAT_ACKED
76 #define sIV SCTP_CONNTRACK_MAX
77
78 /*
79 These are the descriptions of the states:
80
81 NOTE: These state names are tantalizingly similar to the states of an
82 SCTP endpoint. But the interpretation of the states is a little different,
83 considering that these are the states of the connection and not of an end
84 point. Please note the subtleties. -Kiran
85
86 NONE - Nothing so far.
87 COOKIE WAIT - We have seen an INIT chunk in the original direction, or also
88 an INIT_ACK chunk in the reply direction.
89 COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction.
90 ESTABLISHED - We have seen a COOKIE_ACK in the reply direction.
91 SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction.
92 SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin.
93 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
94 to that of the SHUTDOWN chunk.
95 CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
96 the SHUTDOWN chunk. Connection is closed.
97 HEARTBEAT_SENT - We have seen a HEARTBEAT in a new flow.
98 HEARTBEAT_ACKED - We have seen a HEARTBEAT-ACK in the direction opposite to
99 that of the HEARTBEAT chunk. Secondary connection is
100 established.
101 */
102
103 /* TODO
104 - I have assumed that the first INIT is in the original direction.
105 This messes things when an INIT comes in the reply direction in CLOSED
106 state.
107 - Check the error type in the reply dir before transitioning from
108 cookie echoed to closed.
109 - Sec 5.2.4 of RFC 2960
110 - Full Multi Homing support.
111 */
112
113 /* SCTP conntrack state transitions */
114 static const u8 sctp_conntracks[2][11][SCTP_CONNTRACK_MAX] = {
115 {
116 /* ORIGINAL */
117 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
118 /* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA, sCW, sHA},
119 /* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},
120 /* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
121 /* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA, sCL, sSS},
122 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA, sSA, sHA},
123 /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't have Stale cookie*/
124 /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* 5.2.4 - Big TODO */
125 /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't come in orig dir */
126 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL, sCL, sHA},
127 /* heartbeat */ {sHS, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA},
128 /* heartbeat_ack*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA}
129 },
130 {
131 /* REPLY */
132 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
133 /* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* INIT in sCL Big TODO */
134 /* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},
135 /* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV, sCL},
136 /* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA, sIV, sSR},
137 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA, sIV, sHA},
138 /* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA, sIV, sHA},
139 /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* Can't come in reply dir */
140 /* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA, sIV, sHA},
141 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL, sIV, sHA},
142 /* heartbeat */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA},
143 /* heartbeat_ack*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHA, sHA}
144 }
145 };
146
147 static int sctp_net_id __read_mostly;
148 struct sctp_net {
149 struct nf_proto_net pn;
150 unsigned int timeouts[SCTP_CONNTRACK_MAX];
151 };
152
153 static inline struct sctp_net *sctp_pernet(struct net *net)
154 {
155 return net_generic(net, sctp_net_id);
156 }
157
158 static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
159 struct net *net, struct nf_conntrack_tuple *tuple)
160 {
161 const struct sctphdr *hp;
162 struct sctphdr _hdr;
163
164 /* Actually only need first 8 bytes. */
165 hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
166 if (hp == NULL)
167 return false;
168
169 tuple->src.u.sctp.port = hp->source;
170 tuple->dst.u.sctp.port = hp->dest;
171 return true;
172 }
173
174 static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
175 const struct nf_conntrack_tuple *orig)
176 {
177 tuple->src.u.sctp.port = orig->dst.u.sctp.port;
178 tuple->dst.u.sctp.port = orig->src.u.sctp.port;
179 return true;
180 }
181
182 /* Print out the per-protocol part of the tuple. */
183 static void sctp_print_tuple(struct seq_file *s,
184 const struct nf_conntrack_tuple *tuple)
185 {
186 seq_printf(s, "sport=%hu dport=%hu ",
187 ntohs(tuple->src.u.sctp.port),
188 ntohs(tuple->dst.u.sctp.port));
189 }
190
191 /* Print out the private part of the conntrack. */
192 static void sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
193 {
194 seq_printf(s, "%s ", sctp_conntrack_names[ct->proto.sctp.state]);
195 }
196
197 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \
198 for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \
199 (offset) < (skb)->len && \
200 ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \
201 (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
202
203 /* Some validity checks to make sure the chunks are fine */
204 static int do_basic_checks(struct nf_conn *ct,
205 const struct sk_buff *skb,
206 unsigned int dataoff,
207 unsigned long *map)
208 {
209 u_int32_t offset, count;
210 sctp_chunkhdr_t _sch, *sch;
211 int flag;
212
213 flag = 0;
214
215 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
216 pr_debug("Chunk Num: %d Type: %d\n", count, sch->type);
217
218 if (sch->type == SCTP_CID_INIT ||
219 sch->type == SCTP_CID_INIT_ACK ||
220 sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
221 flag = 1;
222
223 /*
224 * Cookie Ack/Echo chunks not the first OR
225 * Init / Init Ack / Shutdown compl chunks not the only chunks
226 * OR zero-length.
227 */
228 if (((sch->type == SCTP_CID_COOKIE_ACK ||
229 sch->type == SCTP_CID_COOKIE_ECHO ||
230 flag) &&
231 count != 0) || !sch->length) {
232 pr_debug("Basic checks failed\n");
233 return 1;
234 }
235
236 if (map)
237 set_bit(sch->type, map);
238 }
239
240 pr_debug("Basic checks passed\n");
241 return count == 0;
242 }
243
244 static int sctp_new_state(enum ip_conntrack_dir dir,
245 enum sctp_conntrack cur_state,
246 int chunk_type)
247 {
248 int i;
249
250 pr_debug("Chunk type: %d\n", chunk_type);
251
252 switch (chunk_type) {
253 case SCTP_CID_INIT:
254 pr_debug("SCTP_CID_INIT\n");
255 i = 0;
256 break;
257 case SCTP_CID_INIT_ACK:
258 pr_debug("SCTP_CID_INIT_ACK\n");
259 i = 1;
260 break;
261 case SCTP_CID_ABORT:
262 pr_debug("SCTP_CID_ABORT\n");
263 i = 2;
264 break;
265 case SCTP_CID_SHUTDOWN:
266 pr_debug("SCTP_CID_SHUTDOWN\n");
267 i = 3;
268 break;
269 case SCTP_CID_SHUTDOWN_ACK:
270 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
271 i = 4;
272 break;
273 case SCTP_CID_ERROR:
274 pr_debug("SCTP_CID_ERROR\n");
275 i = 5;
276 break;
277 case SCTP_CID_COOKIE_ECHO:
278 pr_debug("SCTP_CID_COOKIE_ECHO\n");
279 i = 6;
280 break;
281 case SCTP_CID_COOKIE_ACK:
282 pr_debug("SCTP_CID_COOKIE_ACK\n");
283 i = 7;
284 break;
285 case SCTP_CID_SHUTDOWN_COMPLETE:
286 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
287 i = 8;
288 break;
289 case SCTP_CID_HEARTBEAT:
290 pr_debug("SCTP_CID_HEARTBEAT");
291 i = 9;
292 break;
293 case SCTP_CID_HEARTBEAT_ACK:
294 pr_debug("SCTP_CID_HEARTBEAT_ACK");
295 i = 10;
296 break;
297 default:
298 /* Other chunks like DATA or SACK do not change the state */
299 pr_debug("Unknown chunk type, Will stay in %s\n",
300 sctp_conntrack_names[cur_state]);
301 return cur_state;
302 }
303
304 pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n",
305 dir, sctp_conntrack_names[cur_state], chunk_type,
306 sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
307
308 return sctp_conntracks[dir][i][cur_state];
309 }
310
311 static unsigned int *sctp_get_timeouts(struct net *net)
312 {
313 return sctp_pernet(net)->timeouts;
314 }
315
316 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
317 static int sctp_packet(struct nf_conn *ct,
318 const struct sk_buff *skb,
319 unsigned int dataoff,
320 enum ip_conntrack_info ctinfo,
321 u_int8_t pf,
322 unsigned int hooknum,
323 unsigned int *timeouts)
324 {
325 enum sctp_conntrack new_state, old_state;
326 enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
327 const struct sctphdr *sh;
328 struct sctphdr _sctph;
329 const struct sctp_chunkhdr *sch;
330 struct sctp_chunkhdr _sch;
331 u_int32_t offset, count;
332 unsigned long map[256 / sizeof(unsigned long)] = { 0 };
333
334 sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
335 if (sh == NULL)
336 goto out;
337
338 if (do_basic_checks(ct, skb, dataoff, map) != 0)
339 goto out;
340
341 /* Check the verification tag (Sec 8.5) */
342 if (!test_bit(SCTP_CID_INIT, map) &&
343 !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
344 !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
345 !test_bit(SCTP_CID_ABORT, map) &&
346 !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
347 !test_bit(SCTP_CID_HEARTBEAT, map) &&
348 !test_bit(SCTP_CID_HEARTBEAT_ACK, map) &&
349 sh->vtag != ct->proto.sctp.vtag[dir]) {
350 pr_debug("Verification tag check failed\n");
351 goto out;
352 }
353
354 old_state = new_state = SCTP_CONNTRACK_NONE;
355 spin_lock_bh(&ct->lock);
356 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
357 /* Special cases of Verification tag check (Sec 8.5.1) */
358 if (sch->type == SCTP_CID_INIT) {
359 /* Sec 8.5.1 (A) */
360 if (sh->vtag != 0)
361 goto out_unlock;
362 } else if (sch->type == SCTP_CID_ABORT) {
363 /* Sec 8.5.1 (B) */
364 if (sh->vtag != ct->proto.sctp.vtag[dir] &&
365 sh->vtag != ct->proto.sctp.vtag[!dir])
366 goto out_unlock;
367 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
368 /* Sec 8.5.1 (C) */
369 if (sh->vtag != ct->proto.sctp.vtag[dir] &&
370 sh->vtag != ct->proto.sctp.vtag[!dir] &&
371 sch->flags & SCTP_CHUNK_FLAG_T)
372 goto out_unlock;
373 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
374 /* Sec 8.5.1 (D) */
375 if (sh->vtag != ct->proto.sctp.vtag[dir])
376 goto out_unlock;
377 } else if (sch->type == SCTP_CID_HEARTBEAT ||
378 sch->type == SCTP_CID_HEARTBEAT_ACK) {
379 if (ct->proto.sctp.vtag[dir] == 0) {
380 pr_debug("Setting vtag %x for dir %d\n",
381 sh->vtag, dir);
382 ct->proto.sctp.vtag[dir] = sh->vtag;
383 } else if (sh->vtag != ct->proto.sctp.vtag[dir]) {
384 pr_debug("Verification tag check failed\n");
385 goto out_unlock;
386 }
387 }
388
389 old_state = ct->proto.sctp.state;
390 new_state = sctp_new_state(dir, old_state, sch->type);
391
392 /* Invalid */
393 if (new_state == SCTP_CONNTRACK_MAX) {
394 pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
395 "conntrack=%u\n",
396 dir, sch->type, old_state);
397 goto out_unlock;
398 }
399
400 /* If it is an INIT or an INIT ACK note down the vtag */
401 if (sch->type == SCTP_CID_INIT ||
402 sch->type == SCTP_CID_INIT_ACK) {
403 sctp_inithdr_t _inithdr, *ih;
404
405 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
406 sizeof(_inithdr), &_inithdr);
407 if (ih == NULL)
408 goto out_unlock;
409 pr_debug("Setting vtag %x for dir %d\n",
410 ih->init_tag, !dir);
411 ct->proto.sctp.vtag[!dir] = ih->init_tag;
412 }
413
414 ct->proto.sctp.state = new_state;
415 if (old_state != new_state)
416 nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
417 }
418 spin_unlock_bh(&ct->lock);
419
420 nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]);
421
422 if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED &&
423 dir == IP_CT_DIR_REPLY &&
424 new_state == SCTP_CONNTRACK_ESTABLISHED) {
425 pr_debug("Setting assured bit\n");
426 set_bit(IPS_ASSURED_BIT, &ct->status);
427 nf_conntrack_event_cache(IPCT_ASSURED, ct);
428 }
429
430 return NF_ACCEPT;
431
432 out_unlock:
433 spin_unlock_bh(&ct->lock);
434 out:
435 return -NF_ACCEPT;
436 }
437
438 /* Called when a new connection for this protocol found. */
439 static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
440 unsigned int dataoff, unsigned int *timeouts)
441 {
442 enum sctp_conntrack new_state;
443 const struct sctphdr *sh;
444 struct sctphdr _sctph;
445 const struct sctp_chunkhdr *sch;
446 struct sctp_chunkhdr _sch;
447 u_int32_t offset, count;
448 unsigned long map[256 / sizeof(unsigned long)] = { 0 };
449
450 sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
451 if (sh == NULL)
452 return false;
453
454 if (do_basic_checks(ct, skb, dataoff, map) != 0)
455 return false;
456
457 /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
458 if (test_bit(SCTP_CID_ABORT, map) ||
459 test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
460 test_bit(SCTP_CID_COOKIE_ACK, map))
461 return false;
462
463 memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp));
464 new_state = SCTP_CONNTRACK_MAX;
465 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
466 /* Don't need lock here: this conntrack not in circulation yet */
467 new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
468 SCTP_CONNTRACK_NONE, sch->type);
469
470 /* Invalid: delete conntrack */
471 if (new_state == SCTP_CONNTRACK_NONE ||
472 new_state == SCTP_CONNTRACK_MAX) {
473 pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
474 return false;
475 }
476
477 /* Copy the vtag into the state info */
478 if (sch->type == SCTP_CID_INIT) {
479 if (sh->vtag == 0) {
480 sctp_inithdr_t _inithdr, *ih;
481
482 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
483 sizeof(_inithdr), &_inithdr);
484 if (ih == NULL)
485 return false;
486
487 pr_debug("Setting vtag %x for new conn\n",
488 ih->init_tag);
489
490 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
491 ih->init_tag;
492 } else {
493 /* Sec 8.5.1 (A) */
494 return false;
495 }
496 } else if (sch->type == SCTP_CID_HEARTBEAT) {
497 pr_debug("Setting vtag %x for secondary conntrack\n",
498 sh->vtag);
499 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = sh->vtag;
500 }
501 /* If it is a shutdown ack OOTB packet, we expect a return
502 shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
503 else {
504 pr_debug("Setting vtag %x for new conn OOTB\n",
505 sh->vtag);
506 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
507 }
508
509 ct->proto.sctp.state = new_state;
510 }
511
512 return true;
513 }
514
515 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
516
517 #include <linux/netfilter/nfnetlink.h>
518 #include <linux/netfilter/nfnetlink_conntrack.h>
519
520 static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
521 struct nf_conn *ct)
522 {
523 struct nlattr *nest_parms;
524
525 spin_lock_bh(&ct->lock);
526 nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED);
527 if (!nest_parms)
528 goto nla_put_failure;
529
530 if (nla_put_u8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state) ||
531 nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL,
532 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]) ||
533 nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_REPLY,
534 ct->proto.sctp.vtag[IP_CT_DIR_REPLY]))
535 goto nla_put_failure;
536
537 spin_unlock_bh(&ct->lock);
538
539 nla_nest_end(skb, nest_parms);
540
541 return 0;
542
543 nla_put_failure:
544 spin_unlock_bh(&ct->lock);
545 return -1;
546 }
547
548 static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = {
549 [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 },
550 [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 },
551 [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 },
552 };
553
554 static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
555 {
556 struct nlattr *attr = cda[CTA_PROTOINFO_SCTP];
557 struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1];
558 int err;
559
560 /* updates may not contain the internal protocol info, skip parsing */
561 if (!attr)
562 return 0;
563
564 err = nla_parse_nested(tb,
565 CTA_PROTOINFO_SCTP_MAX,
566 attr,
567 sctp_nla_policy);
568 if (err < 0)
569 return err;
570
571 if (!tb[CTA_PROTOINFO_SCTP_STATE] ||
572 !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] ||
573 !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY])
574 return -EINVAL;
575
576 spin_lock_bh(&ct->lock);
577 ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]);
578 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] =
579 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]);
580 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
581 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]);
582 spin_unlock_bh(&ct->lock);
583
584 return 0;
585 }
586
587 static int sctp_nlattr_size(void)
588 {
589 return nla_total_size(0) /* CTA_PROTOINFO_SCTP */
590 + nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1);
591 }
592 #endif
593
594 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
595
596 #include <linux/netfilter/nfnetlink.h>
597 #include <linux/netfilter/nfnetlink_cttimeout.h>
598
599 static int sctp_timeout_nlattr_to_obj(struct nlattr *tb[],
600 struct net *net, void *data)
601 {
602 unsigned int *timeouts = data;
603 struct sctp_net *sn = sctp_pernet(net);
604 int i;
605
606 /* set default SCTP timeouts. */
607 for (i=0; i<SCTP_CONNTRACK_MAX; i++)
608 timeouts[i] = sn->timeouts[i];
609
610 /* there's a 1:1 mapping between attributes and protocol states. */
611 for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) {
612 if (tb[i]) {
613 timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ;
614 }
615 }
616 return 0;
617 }
618
619 static int
620 sctp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
621 {
622 const unsigned int *timeouts = data;
623 int i;
624
625 for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) {
626 if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ)))
627 goto nla_put_failure;
628 }
629 return 0;
630
631 nla_put_failure:
632 return -ENOSPC;
633 }
634
635 static const struct nla_policy
636 sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = {
637 [CTA_TIMEOUT_SCTP_CLOSED] = { .type = NLA_U32 },
638 [CTA_TIMEOUT_SCTP_COOKIE_WAIT] = { .type = NLA_U32 },
639 [CTA_TIMEOUT_SCTP_COOKIE_ECHOED] = { .type = NLA_U32 },
640 [CTA_TIMEOUT_SCTP_ESTABLISHED] = { .type = NLA_U32 },
641 [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT] = { .type = NLA_U32 },
642 [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD] = { .type = NLA_U32 },
643 [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 },
644 [CTA_TIMEOUT_SCTP_HEARTBEAT_SENT] = { .type = NLA_U32 },
645 [CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED] = { .type = NLA_U32 },
646 };
647 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
648
649
650 #ifdef CONFIG_SYSCTL
651 static struct ctl_table sctp_sysctl_table[] = {
652 {
653 .procname = "nf_conntrack_sctp_timeout_closed",
654 .maxlen = sizeof(unsigned int),
655 .mode = 0644,
656 .proc_handler = proc_dointvec_jiffies,
657 },
658 {
659 .procname = "nf_conntrack_sctp_timeout_cookie_wait",
660 .maxlen = sizeof(unsigned int),
661 .mode = 0644,
662 .proc_handler = proc_dointvec_jiffies,
663 },
664 {
665 .procname = "nf_conntrack_sctp_timeout_cookie_echoed",
666 .maxlen = sizeof(unsigned int),
667 .mode = 0644,
668 .proc_handler = proc_dointvec_jiffies,
669 },
670 {
671 .procname = "nf_conntrack_sctp_timeout_established",
672 .maxlen = sizeof(unsigned int),
673 .mode = 0644,
674 .proc_handler = proc_dointvec_jiffies,
675 },
676 {
677 .procname = "nf_conntrack_sctp_timeout_shutdown_sent",
678 .maxlen = sizeof(unsigned int),
679 .mode = 0644,
680 .proc_handler = proc_dointvec_jiffies,
681 },
682 {
683 .procname = "nf_conntrack_sctp_timeout_shutdown_recd",
684 .maxlen = sizeof(unsigned int),
685 .mode = 0644,
686 .proc_handler = proc_dointvec_jiffies,
687 },
688 {
689 .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
690 .maxlen = sizeof(unsigned int),
691 .mode = 0644,
692 .proc_handler = proc_dointvec_jiffies,
693 },
694 {
695 .procname = "nf_conntrack_sctp_timeout_heartbeat_sent",
696 .maxlen = sizeof(unsigned int),
697 .mode = 0644,
698 .proc_handler = proc_dointvec_jiffies,
699 },
700 {
701 .procname = "nf_conntrack_sctp_timeout_heartbeat_acked",
702 .maxlen = sizeof(unsigned int),
703 .mode = 0644,
704 .proc_handler = proc_dointvec_jiffies,
705 },
706 { }
707 };
708
709 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
710 static struct ctl_table sctp_compat_sysctl_table[] = {
711 {
712 .procname = "ip_conntrack_sctp_timeout_closed",
713 .maxlen = sizeof(unsigned int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec_jiffies,
716 },
717 {
718 .procname = "ip_conntrack_sctp_timeout_cookie_wait",
719 .maxlen = sizeof(unsigned int),
720 .mode = 0644,
721 .proc_handler = proc_dointvec_jiffies,
722 },
723 {
724 .procname = "ip_conntrack_sctp_timeout_cookie_echoed",
725 .maxlen = sizeof(unsigned int),
726 .mode = 0644,
727 .proc_handler = proc_dointvec_jiffies,
728 },
729 {
730 .procname = "ip_conntrack_sctp_timeout_established",
731 .maxlen = sizeof(unsigned int),
732 .mode = 0644,
733 .proc_handler = proc_dointvec_jiffies,
734 },
735 {
736 .procname = "ip_conntrack_sctp_timeout_shutdown_sent",
737 .maxlen = sizeof(unsigned int),
738 .mode = 0644,
739 .proc_handler = proc_dointvec_jiffies,
740 },
741 {
742 .procname = "ip_conntrack_sctp_timeout_shutdown_recd",
743 .maxlen = sizeof(unsigned int),
744 .mode = 0644,
745 .proc_handler = proc_dointvec_jiffies,
746 },
747 {
748 .procname = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
749 .maxlen = sizeof(unsigned int),
750 .mode = 0644,
751 .proc_handler = proc_dointvec_jiffies,
752 },
753 { }
754 };
755 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
756 #endif
757
758 static int sctp_kmemdup_sysctl_table(struct nf_proto_net *pn,
759 struct sctp_net *sn)
760 {
761 #ifdef CONFIG_SYSCTL
762 if (pn->ctl_table)
763 return 0;
764
765 pn->ctl_table = kmemdup(sctp_sysctl_table,
766 sizeof(sctp_sysctl_table),
767 GFP_KERNEL);
768 if (!pn->ctl_table)
769 return -ENOMEM;
770
771 pn->ctl_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED];
772 pn->ctl_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT];
773 pn->ctl_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED];
774 pn->ctl_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED];
775 pn->ctl_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT];
776 pn->ctl_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD];
777 pn->ctl_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT];
778 pn->ctl_table[7].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_SENT];
779 pn->ctl_table[8].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_ACKED];
780 #endif
781 return 0;
782 }
783
784 static int sctp_kmemdup_compat_sysctl_table(struct nf_proto_net *pn,
785 struct sctp_net *sn)
786 {
787 #ifdef CONFIG_SYSCTL
788 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
789 pn->ctl_compat_table = kmemdup(sctp_compat_sysctl_table,
790 sizeof(sctp_compat_sysctl_table),
791 GFP_KERNEL);
792 if (!pn->ctl_compat_table)
793 return -ENOMEM;
794
795 pn->ctl_compat_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED];
796 pn->ctl_compat_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT];
797 pn->ctl_compat_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED];
798 pn->ctl_compat_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED];
799 pn->ctl_compat_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT];
800 pn->ctl_compat_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD];
801 pn->ctl_compat_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT];
802 #endif
803 #endif
804 return 0;
805 }
806
807 static int sctp_init_net(struct net *net, u_int16_t proto)
808 {
809 int ret;
810 struct sctp_net *sn = sctp_pernet(net);
811 struct nf_proto_net *pn = &sn->pn;
812
813 if (!pn->users) {
814 int i;
815
816 for (i = 0; i < SCTP_CONNTRACK_MAX; i++)
817 sn->timeouts[i] = sctp_timeouts[i];
818 }
819
820 if (proto == AF_INET) {
821 ret = sctp_kmemdup_compat_sysctl_table(pn, sn);
822 if (ret < 0)
823 return ret;
824
825 ret = sctp_kmemdup_sysctl_table(pn, sn);
826 if (ret < 0)
827 nf_ct_kfree_compat_sysctl_table(pn);
828 } else
829 ret = sctp_kmemdup_sysctl_table(pn, sn);
830
831 return ret;
832 }
833
834 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
835 .l3proto = PF_INET,
836 .l4proto = IPPROTO_SCTP,
837 .name = "sctp",
838 .pkt_to_tuple = sctp_pkt_to_tuple,
839 .invert_tuple = sctp_invert_tuple,
840 .print_tuple = sctp_print_tuple,
841 .print_conntrack = sctp_print_conntrack,
842 .packet = sctp_packet,
843 .get_timeouts = sctp_get_timeouts,
844 .new = sctp_new,
845 .me = THIS_MODULE,
846 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
847 .to_nlattr = sctp_to_nlattr,
848 .nlattr_size = sctp_nlattr_size,
849 .from_nlattr = nlattr_to_sctp,
850 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
851 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
852 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
853 .nla_policy = nf_ct_port_nla_policy,
854 #endif
855 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
856 .ctnl_timeout = {
857 .nlattr_to_obj = sctp_timeout_nlattr_to_obj,
858 .obj_to_nlattr = sctp_timeout_obj_to_nlattr,
859 .nlattr_max = CTA_TIMEOUT_SCTP_MAX,
860 .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX,
861 .nla_policy = sctp_timeout_nla_policy,
862 },
863 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
864 .net_id = &sctp_net_id,
865 .init_net = sctp_init_net,
866 };
867
868 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
869 .l3proto = PF_INET6,
870 .l4proto = IPPROTO_SCTP,
871 .name = "sctp",
872 .pkt_to_tuple = sctp_pkt_to_tuple,
873 .invert_tuple = sctp_invert_tuple,
874 .print_tuple = sctp_print_tuple,
875 .print_conntrack = sctp_print_conntrack,
876 .packet = sctp_packet,
877 .get_timeouts = sctp_get_timeouts,
878 .new = sctp_new,
879 .me = THIS_MODULE,
880 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
881 .to_nlattr = sctp_to_nlattr,
882 .nlattr_size = sctp_nlattr_size,
883 .from_nlattr = nlattr_to_sctp,
884 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
885 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
886 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
887 .nla_policy = nf_ct_port_nla_policy,
888 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
889 .ctnl_timeout = {
890 .nlattr_to_obj = sctp_timeout_nlattr_to_obj,
891 .obj_to_nlattr = sctp_timeout_obj_to_nlattr,
892 .nlattr_max = CTA_TIMEOUT_SCTP_MAX,
893 .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX,
894 .nla_policy = sctp_timeout_nla_policy,
895 },
896 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
897 #endif
898 .net_id = &sctp_net_id,
899 .init_net = sctp_init_net,
900 };
901
902 static int sctp_net_init(struct net *net)
903 {
904 int ret = 0;
905
906 ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_sctp4);
907 if (ret < 0) {
908 pr_err("nf_conntrack_sctp4: pernet registration failed.\n");
909 goto out;
910 }
911 ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_sctp6);
912 if (ret < 0) {
913 pr_err("nf_conntrack_sctp6: pernet registration failed.\n");
914 goto cleanup_sctp4;
915 }
916 return 0;
917
918 cleanup_sctp4:
919 nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp4);
920 out:
921 return ret;
922 }
923
924 static void sctp_net_exit(struct net *net)
925 {
926 nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp6);
927 nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp4);
928 }
929
930 static struct pernet_operations sctp_net_ops = {
931 .init = sctp_net_init,
932 .exit = sctp_net_exit,
933 .id = &sctp_net_id,
934 .size = sizeof(struct sctp_net),
935 };
936
937 static int __init nf_conntrack_proto_sctp_init(void)
938 {
939 int ret;
940
941 ret = register_pernet_subsys(&sctp_net_ops);
942 if (ret < 0)
943 goto out_pernet;
944
945 ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_sctp4);
946 if (ret < 0)
947 goto out_sctp4;
948
949 ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_sctp6);
950 if (ret < 0)
951 goto out_sctp6;
952
953 return 0;
954 out_sctp6:
955 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
956 out_sctp4:
957 unregister_pernet_subsys(&sctp_net_ops);
958 out_pernet:
959 return ret;
960 }
961
962 static void __exit nf_conntrack_proto_sctp_fini(void)
963 {
964 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
965 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
966 unregister_pernet_subsys(&sctp_net_ops);
967 }
968
969 module_init(nf_conntrack_proto_sctp_init);
970 module_exit(nf_conntrack_proto_sctp_fini);
971
972 MODULE_LICENSE("GPL");
973 MODULE_AUTHOR("Kiran Kumar Immidi");
974 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
975 MODULE_ALIAS("ip_conntrack_proto_sctp");
Linux kernel - Deliverables
This page took 0.055354 seconds and 5 git commands to generate.